Electric fuse.



T. E. MURRAY.

' ELECTRIC FUSE.

APPLICATION FILED MAR.10,1913.

Patented July 21, 1914..

amen srArEs PATENT orricn."

THOMAS E. MURRAY, or NEW YORK, 'N. Y.

ELECTRIC ruse.

To all whom it may concern:

Be it known that I, THOMAS E. MURRAY, a citizen of the United States, residing at New York, inthe county of New York and State of New York, have invented a certain new and useful Improvement in Electric Fuses,

of which the following is a specification.

The invention is an electric fuse, and has for its object to cheapen and simplify the caps B, O and the case.

material.

dercut recesses on the case,

construction, and to permit of ready substitution of new 'fuse strips for those that are blown.

The device comprises a tubular case havmg metallic end caps and a fuse strip, or

strips, held in place by the engagement of. its or their ends between said case and said caps the said strip or strips being separated within the case from the wall thereof and inclosed in a filling of comminuted refractory The-caps are held on the cas e by leaf springs'having hooks engagingwith unfore, readily removable to release said strip, or strips;

In the, accompanying-drawingsFigure 1 is a longitudinal section ofasingle strip fuse, and Fig. 2 is a similar view, showing a plurality of strips in place.

Similar letters of reference indicate like parts.

A is a tubular case of fiber or other insulating material.

B and C are end caps of metal. NVithin each ofsaidcaps is secured a leaf spring D having its outer end bentover or hooked...

IN hen the caps are placed upon the case, said hooked ends engage with shoulders, preferably produced by recesses in the case.

E is the fuse strip, which protrudes at each, end beyond the case, the. protruding portions being bent over, as shown at F, to lie closely against the outer surface of the case. The caps B, C are placed over said bent over ends, so that said ends thus become clamped and so engaged between the Inthe caps 13 and C openings are made, through which the comminuted filling material G may be introduced, saidopenings being afterward closed by inserted masses or plugs H of fibrous re I and are, therefractory material, such as asbestos floss. Said material after being compressed during insertion in the openings expands, as shown in place. v

Where a double fuse is desired, I place in the case A a second fuse strip 1-, having its ends J turned over in the same way as the ends of strip E, the ends of both strips be- ,ing engaged between the caps B and C and the case. The position of the springs Dis then as indicated by the dotted lines in Fig.

2. This construction avoids the permanent mechanical connection of the fuse, or fuses, directly to the fuse caps by solder crotherwise, and substitutes the securing of the ends of the strip, 'or strips, to the case by frictional engagement between caps and case.

Because thestrip or strips are separated,

from the case walls and inclosed in the'comminuted refractory material, injury to the case by blowing of, the fuse is prevented; The caps bein ing the hooke the shoulders on the case, newfuse strips be quickly and easily substituted for those that become blown.

I claim:

' Specification of Letters .Patent. Patented July 21, 1pm., Application filed March 10*, 1913. Serial No. 753,358. I

in the drawings, and .so becomes-self-locked readily removable, by releasends of the springs D from 1. An electric fuse, comprising a tubular case, a fuse strip secured at its ends to said case, end caps on said case, one of said caps being providedwith' an opening smaller in area than said case, a filling of comminuted refractory material inclosing said strip, and a plug of fibrous refractory material compressed in said opening andlocked therein by ex ansion Within said case.

' 2. in electric fuse, comprising a tubular case having external undercut recesses, end

caps on said case, leaf springs secured on the 1nner sides ofv said caps and provided with hooked extremities engaging in said recesses,

and a fuse strip in said caseand connected to'said caps.

'In testimony signature in presence of two witnesses.

, THOMAS E. MURRAY.

Witnesses:

GERTRUDE T. PORTER,

MAY T. MoGAnnY.

whereof have affixed my, 

